修正案
发表于 2025-3-23 11:52:37
Isotopic Signatures of Presolar Materials in Interplanetary DustThese effects are most likely due to the preservation of presolar interstellar materials. While the elevated D/H ratios probably resulted from mass fractionation during chemical reactions at very low < 100 K temperatures, the origin of the N isotopic anomalies remains unresolved. The bulk of the N-b
令人心醉
发表于 2025-3-23 16:02:22
Nitrogen Isotopes on the Moon: Archives of the Solar and Planetary Contributions to the Inner Solarprimitive and differentiated meteorites, and comets. Expressed in the delta notation, (δ.N={[.N/.N]./[.N/.N].-1}x1000, in parts per mil, or ‰, where the standard is atmospheric N having 15N/14N=0.003676 )ranges from -250‰ (the lower limit of lunar soil values) up to 1600‰ (measured in the meteorite
周兴旺
发表于 2025-3-23 19:39:24
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floodgate
发表于 2025-3-24 01:06:38
On Noble Gas Processing in the Solar Accretion Disksotopic and elemental compositions that presumably characterized the early solar accretion disk. Noble gas fractionation by mass-dependent dissipation of the solar nebula, as suggested by Ozima .. (1998), is examined in the context of a model developed by Johnstone .. (1998) for accretion disk photo
阻止
发表于 2025-3-24 02:25:50
Elemental and Isotopic Abundances of Carbon and Nitrogen in Meteorites Primary phases, inherited from the solar nebula, are frequently isotopically heterogeneous, and surprisingly resistant to modification through parent body processing. Even melted and recrystallised meteorites retain primordial carbon and nitrogen isotopic signatures.
谈判
发表于 2025-3-24 09:53:11
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他一致
发表于 2025-3-24 13:07:05
Deuterium Fractionation in Interstellar Cloudse resulting enhancement in H.D. can result in its abundance being greater than that of H.. at 10 K. Transfer of the deuteron from H.D. can then lead to the efficient formation of multiply deuterated species, such as NHD. and ND.. Fractionation can also occur in grain surface reactions and some simple models are discussed.
向外供接触
发表于 2025-3-24 15:31:49
Deuterium in Molecules of the Interstellar Mediumon the deuterium fractionation and on the subsequent derivation of the elemental deuterium to hydrogen ratio. Steady state versus time dependent models are discussed and the role of initial conditions is emphasized.
纵火
发表于 2025-3-24 23:02:29
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打击
发表于 2025-3-25 00:19:52
Isotopic Signatures of Presolar Materials in Interplanetary Dustactionation during chemical reactions at very low < 100 K temperatures, the origin of the N isotopic anomalies remains unresolved. The bulk of the N-bearing material may have obtained its isotopic signatures from low temperature chemistry, but a nucleosynthetic origin is also possible.